jawab nih coy, gw ulangan nih
Matematika
RainerT
Pertanyaan
jawab nih coy, gw ulangan nih
2 Jawaban
-
1. Jawaban FawwazArbs
1. 2x + 5 = 15
2x = 15 - 5
2x = 10
x = 10/2 ---> 5
2. f(-6) = 3 - 2(-6)
= 3 + 12
= 15
3. f(1) = a + b = 4
f(3) = 3a + b = 14
_______________ -
- 2a = -10
a = 5 ........ a
5 + b = 4
b = 4 - 5 3
b = -1 ....... b
f(-5) = 5(-5) - 1
= -25 - 1
= -26
4. [tex] \frac{2x + 1}{2x + 3} [/tex] = 3
2x + 1 = 3(2x +3)
2x + 1 = 6x + 9
4x = -8
x = -2
5. 2x - 1 = 3x - 6
x = 5
h = 2(5) - 1
= 9
h(7) = 7(9)
= 53
* Tetapi nomor 9 saya tidak yakin, karena soalnya susah dimengerti -
2. Jawaban WiNtErC
9. f(x) = 2x+5
f(c) = 15
2c + 5 = 15
c = 10/2 = 5
10. f(x) = 3 - 2x
f(-6) = 3 - 2(-6)
= 3 +12 = 15
11. f(1) = 4
a+b = 4 a = 4 - b
f(3) = 14
3a + b = 14
3(4 - b) +b = 14
12 - 3b + b = 14
-2b = 2
b = -1
a = 4 - b
a = 4 +1 = 5
f(-5) = 5(-5) -1
= -25 -1 = -26
12. h(x) = 2x +1 / 2x + 3
h(a) = 3
2a + 1 / 2a +3 = 3
2a + 1 = 6a + 9
4a = -8
a = -2
13. h(2x - 1) = 3x -6
2x - 1 = 7
x = 4
3(4) - 6= 6
h(7) = 6
maaf klo salh...